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The challenge of improving livelihoods in the remote mountains of northern Pakistan provides the backdrop for a series of reflective studies about social and rural development, featuring the analyses of multi-dimensional poverty, gender, microfinance, collective action and institutional options for natural resource management.
This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.
This thesis presents optical methods to split the energy levels of electronic valleys in transition-metal dichalcogenides (TMDs) by means of coherent light-matter interactions. The electronic valleys found in monolayer TMDs such as MoS2, WS2, and WSe2 are among the many novel properties exhibited by semiconductors when thinned down to a few atomic layers, and have have been proposed as a new way to carry information in next generation devices (so-called valleytronics). These valleys are, however, normally locked in the same energy level, which limits their potential use for applications. The author describes experiments performed with a pump-probe technique using transient absorption spectroscopy on MoS2 and WS2. It is demonstrated that hybridizing the electronic valleys with light allows one to optically tune their energy levels in a controllable valley-selective manner. In particular, by using off-resonance circularly polarized light at small detuning, one can tune the energy level of one valley through the optical Stark effect. Also presented within are observations, at larger detuning, of a separate contribution from the so-called Bloch--Siegert effect, a delicate phenomenon that has eluded direct observation in solids. The two effects obey opposite selection rules, enabling one to separate the two effects at two different valleys.
The ethnographies collected here offer a surprising and compelling picture of change in Russia and Eastern Europe found in no other book to date. Looking at the everyday processes by which individuals and groups forge new lives, the authors challenge the idea that we can understand this transformation by the predictable models_whether capitalism, post-socialism, modernity, or postmodernity. The collection brings together a wide-ranging group of authors from sociology, anthropology, and political science to reveal the complex relationships that still exist between the former socialist world and the world today. Through evocative ethnographic research and writing, they bring to light the unintended consequences of change and show how the 'slates' of the past enter the present not as legacies_but as novel adaptations. Often what appear as 'restorations' of patterns familiar from socialism are something quite different: direct responses to the new market initiatives. By showing the unexpected ways in which these new patterns are emerging, this book charts a new and important course for the study of post-socialist transition.
This volume deals with the transition from the Late Bronze to the Early Iron Age in the central East Jordan Valley, the period of the fall of the Egyptian New Kingdom, and of the birth of a new era, in which small kingdoms such as Ammon, Moab and Israel were born. A broad spectrum of sources is being reviewed: written evidence, excavations and surveys, and ethnographic sources from the 19th century and later. New archaeological evidence is being presented, including a report on the excavations of Tell el-Hammeh on the Zerqa. This evidence, written, material and ethnographical, is incorporated in a new model for the LB-IA transition in the region: a model that explains the events of this turbulent period as the precipitation of a tribal society, where the interactions of tribes and territories determined the political lay-out and shaped the kingdoms of the Iron Age.
When many particles come together how do they organize themselves? And what destroys this organization? Combining experiments and theory, this book describes intriguing quantum phases - metals, superconductors and insulators - and transitions between them. It captures the excitement and the controversies on topics at the forefront of research.
Intersubband transitions in quantum wells have attracted tremendous attention in recent years, mainly due to the promise of applications in the mid and far-infrared regions (2--20 mum). Many of the papers presented in Quantum Well Intersubband Transition Physics and Devices are on the basic linear intersubband transition processes, detector physics and detector application, reflecting the current state of understanding and detector applications, where highly uniform, large focal plane arrays have been demonstrated. Other areas are still in their early stages, including infrared modulation, harmonic generation and emission.
Drawing on an innovative project exploring current mobility transition policies and practices in 14 countries around the world, including key institutions such as the European Union and the United Nations, this book provides a critique of current transitions, mobility and transport policies. The authors consider how our mobility futures have been imagined, what they will potentially look and feel like, what lives we might live in them and what choices we might have to make to get there.
This volume had its origins in an international symposium organised by the Cold Regions Research Centre, and held at Wilfrid Laurier University in November, 1999. The chapters are modified from a selection of the papers at the meeting, and reflect reviews and revisions in light of discussions then. The original idea for the meeting was to address certain questions that the organisers were encountering in their own work, and that we felt had received limited attention in the recent literature. The two broad issues we wanted to address were: the complex associations of actual landforms and processes in cold regions, and how the almost universal legacies of past, different cold environments of the late Quaternary affect these landscapes in the present. The former involves the problem of identifying landform and sediment complexes, and the interrelations of relevant processes. We sought to identify this in terms oflandform and sediment assemblages appropriate to regional and field-oriented concerns.